Smoothwall innderduct is manufactured from High Density Polyethylene (HDPE) and is intended for use in underground and innerduct applications. Smoothwall offers superior protection, increases pathways of existing duct systems and allows extra channels for future cabling needs. Cable can be installed by pre-installed pull-rope or jetting. Interior Ribbed wall offers superior protection, increases pathways of existing duct systems and allows extra channels for future cabling needs. Smoothwall is available in 1 Inch to 4 Inch diameter.